Search results for "cogging torque"

showing 10 items of 13 documents

The use of slightly asymmetrical windings for rotating electrical machines

2018

Historically, asymmetrical windings in electrical machines have been rarely used and only for specified needs, because the adoption of symmetrical configurations has always been considered the only solution during the design stage of electrical machines. The aim of this work is to demonstrate with several examples that the use of slightly asymmetrical windings can be a reasonable choice and, in certain cases, a favorable option during the machine design stage, allowing the possibility of selecting a wider range of slot/pole number combinations, without affecting the performances of the machines. More in detail, an interior permanent magnet synchronous machine equipped with a symmetrical 3-p…

Computer science020209 energy020208 electrical & electronic engineeringWinding designCogging torqueMechanical engineeringEnergy Engineering and Power Technology02 engineering and technologyCogging torqueSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciModeling and simulationHarmonic analysisElectromagnetic coilModeling and Simulation0202 electrical engineering electronic engineering information engineeringAsymmetrical windingElectrical and Electronic EngineeringFEM analysiHarmonic analysi
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A Cogging Torque Minimization Procedure for Interior Permanent Magnet Synchronous Motors Based on a Progressive Modification of the Rotor Lamination …

2022

This article describes a simple cogging torque minimization procedure for interior permanent magnet synchronous machines (IPMSMs), consisting of a progressive modification of the rotor lamination geometry. This procedure can be generalized for the main topologies of PMSM, independently of the number of stator slots or the location of the permanent magnets. For this purpose, a basic IPMSM structure is analyzed by means of the FEM (finite element method) approach, and then, several other IPMSM geometries, obtained by adequately modifying the rotor lamination geometry of the basic IPMSM model without changing its stator configuration, are proposed and discussed. The trends of the cogging torqu…

Control and OptimizationRenewable Energy Sustainability and the EnvironmentEnergy Engineering and Power TechnologyBuilding and Constructioncogging torque interior permanent magnet synchronous motors permanent magnets harmonic analysis FEM analysis rotor laminationElectrical and Electronic EngineeringSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricicogging torque; interior permanent magnet synchronous motors; permanent magnets; harmonic analysis; FEM analysis; rotor laminationEngineering (miscellaneous)Energy (miscellaneous)
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Performance Comparison of Electrical Motors equipped with slightly Asymmetrical Windings

2019

This paper presents a comparison between the performances of electrical machines equipped with slightly asymmetrical windings. More in detail, by modifying the stator geometry of an Interior Permanent Magnet Synchronous Machine equipped with a symmetrical winding configuration, other two slightly asymmetrical winding topologies are obtained. The three models are, then, analyzed by means of a finite element method (FEM) and the related results are compared in terms of cogging torque, static characteristics and leakage factor. The obtained results demonstrate that the adoption of slightly asymmetrical windings could be an interesting alternative solution during the design stage of electrical …

Electric motorMaterials sciencebusiness.industry020209 energy020208 electrical & electronic engineeringWinding designCogging torque02 engineering and technologyStructural engineeringCogging torqueSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciFinite element methodHarmonic analysisElectromagnetic coilPerformance comparison0202 electrical engineering electronic engineering information engineeringStator geometryAsymmetrical windingbusinessFEM analysiHarmonic analysiLeakage (electronics)
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A Method for Reduction of Cogging Torque in PM Machines Using Stepped Magnets

2006

The paper presents a general approach to minimization of the cogging torque in electrical machines using surface-mounted magnets with discrete skew angle. Two types of pole shapes, namely monotonic skewing as well as herringbone-shaped magnets are proposed for the purpose of reducing the cogging torque. The elaborated algorithm is validated against the 3D finite element model as well as experimental data obtained from physical model of the motor. The presented cost-effective method leads to a great reduction of cogging torque with only slight decrease of overall electromagnetic torque.

EngineeringControl theorybusiness.industryMagnetCogging torqueMonotonic functionMinificationReduction (mathematics)Electromagnetic torquebusinessSkew angleFinite element method
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The effect of manufacturing tolerances on a tubular linear ferrite motor

2015

This study presents a numerical and experimental study on the effect of permanent magnet tolerances on the performances of a Tubular Linear Ferrite Motor. The statistical distribution of the magnetic characteristic of a set of commercial magnets is obtained experimentally while the performances of a the tubular motor are numerically evaluated. The performances that have been considered are: cogging force, end effect force and generated thrust. It has been shown that: 1)the statistical variability of the magnets modifies the time behavior of the cogging force; 2)the value of both the end effect cogging force and the generated thrust are directly linked to the values of then remanence field o…

EngineeringFinite element methodManufacturing toleranceSettore ING-IND/11 - Fisica Tecnica AmbientaleMagnetic domainbusiness.industryElectrical engineeringMechanical engineeringThrustTubular Linear Ferrite MotorCogging torqueSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciForgingMagnetic fluxIndustrial and Manufacturing EngineeringRemanenceMagnetSliderFerrite (magnet)Electrical and Electronic Engineeringbusiness
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2D harmonic analysis of the cogging torque in synchronous permanent magnet machines

2004

Presents an approach to determine sources of cogging torque harmonics in permanent magnet electrical machines on the basis of variations of air‐gap magnetic flux density with time and space. The magnetic flux density is determined from the two‐dimensional (2D) finite element model and decomposed into the double Fourier series through the 2D fast Fourier transform (FFT). The real trigonometric form of the Fourier series is used for the purpose to identify those space and time harmonics of magnetic flux density whose involvement in the cogging torque is the greatest relative contribution. Carries out calculations for a symmetric permanent magnet brushless machine for several rotor eccentricit…

EngineeringRotor (electric)business.industryApplied MathematicsFast Fourier transformMathematical analysisCogging torqueComputer Science Applicationslaw.inventionMagnetic fieldHarmonic analysisComputational Theory and MathematicslawHarmonicsMagnetElectronic engineeringElectrical and Electronic EngineeringbusinessFourier seriesCOMPEL - The international journal for computation and mathematics in electrical and electronic engineering
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A cogging torque minimization procedure for IPMSMs based on different laminate geometry

2016

This paper presents a possible minimization procedure of the cogging torque generated by an IPMSM (Interior Permanent Magnet Synchronous Machine) with a progressive modification of a basic geometrical structure of rotor laminates. More in detail, an IPMSM model is analyzed by using a Finite Element Method (FEM) approach. Then, other IPMSM models, which are obtained by modifying the geometry of the IPMSM rotor laminates and by maintaining the same stator configuration, are proposed and discussed. From the obtained simulation results, the cogging torque components for each structure are determined by means of FEM and compared to each other. From this comparison, it can be stated that the cogg…

EngineeringStatorGeometry02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural scienceslaw.inventionlaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringFEM analysi010302 applied physicsRotor (electric)business.industry020208 electrical & electronic engineeringpermanent magnetsCogging torqueCogging torqueFinite element methodIPMSMSettore ING-IND/31 - ElettrotecnicaQuantitative Biology::Quantitative MethodsMagnetMinificationbusinessPermanent magnet synchronous machine2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)
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Cogging torque comparison of Interior Permanent Magnet Synchronous Generators with different stator windings

2017

This paper presents the comparison between the cogging torques produced by four IPMSGs (Interior Permanent Magnet Synchronous Generators) with different stator winding configurations. More in detail, an IPMSG model, which is derived from a commercial geometry, is analyzed through means of a FEM (Finite Element Method) approach. Then, three more structures are determined and analyzed by adequately changing the number of stator slots of the basic IPMSG stator structure and by maintaining the same rotor configuration. From the obtained simulation results, the cogging torque components for each structure are determined and compared. From this comparison, it can be stated that the use of dissymm…

Engineeringbusiness.industryRotor (electric)StatorRenewable Energy Sustainability and the EnvironmentCogging torque; FEM analysis; IPMSG; permanent magnets; Energy Engineering and Power Technology; Renewable Energy Sustainability and the Environment020209 energyCogging torqueEnergy Engineering and Power TechnologyIPMSG02 engineering and technologyCogging torqueForgingFinite element methodlaw.inventionElectromagnetic coillawControl theoryMagnet0202 electrical engineering electronic engineering information engineeringpermanent magnetTorquebusinessFEM analysi
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Finite-element performance comparison of IPMSMs with unsymmetrical double-layer windings

2017

This paper presents a comparison of the performances between IPMSMs (Interior Permanent Magnet Synchronous Machine) with a symmetrical and with two different types of unsymmetrical windings. The aim is to demonstrate that the adoption of slightly unsymmetrical windings does not significantly affect the performances of the machines, both in terms of cogging torque and torque/load angle characteristics, providing also the advantage of a higher possibility of choice in terms of slot number/poles ratio. More in particular, an IPMSM model (named IPMSM-1) derived from a commercial geometry equipped with a symmetrical winding is analyzed by using a Finite Element Method (FEM) approach. The simulat…

Engineeringunsymmetrical windingsStatorCogging torque; FEM analysis; IPMSM; permanent magnets; unsymmetrical windings; Renewable Energy Sustainability and the Environment; Automotive Engineering; Electrical and Electronic EngineeringFEM analysisSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural scienceslaw.inventionHarmonic analysislaw0103 physical sciencesTorqueRenewable EnergyElectrical and Electronic Engineering010306 general physicsFEM analysi010302 applied physicsSustainability and the EnvironmentRotor (electric)business.industryRenewable Energy Sustainability and the EnvironmentElectrical engineeringCogging torquepermanent magnetsStructural engineeringCogging torqueFinite element methodIPMSMSettore ING-IND/31 - ElettrotecnicaElectromagnetic coilMagnetAutomotive Engineeringpermanent magnetunsymmetrical windingbusiness
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Analysis, characterization and minimization of IPMSMs cogging torque with different rotor structures

2015

This paper presents the analysis, characterization and comparison of the cogging torque components generated by five different IPMSM rotor structures. More in detail, an IPMSM model (named IPMSM1), which is derived from a commercial geometry, is analyzed by using a Finite Element Method (FEM) approach. Then, four other IPMSM models, which are obtained by modifying the IPMSM1 rotor structure and by maintaining the same stator configuration, are proposed and analyzed. From the obtained simulation results, the cogging torque components for each structure are determined and compared. From this comparison, a significant cogging torque decrease is occurring for the modified geometries, without af…

Materials scienceStatorFinite element analysiGeometrySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciForginglaw.inventionlawControl theoryRotorTorquePermanent magnet motorFEM analysiRotor (electric)Cogging torquepermanent magnetsCogging torqueFinite element methodIPMSMQuantitative Biology::Quantitative MethodsDirect torque controlTorqueReduction (mathematics)ForgingHarmonic analysioptimization
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